Method for removing fine foreign matters, and rolling bearing using the same

Abstract

Residual fine foreign matters are infallibly removed when manufacturing bearing parts. A removal process of residual fine foreign matters is taken before a high precision water-washing process in a manufacturing process of each component of a rolling bearing. Accordingly, residual fine foreign matters generated in a cutting process, a heat-treating process and a grinding process are removed, including metal powder like a metal chip and falling pieces of bearing components. In the removal process of residual fine foreign matters, ground pieces of corn-cob as a raw material are used for a grinding medium. Thus, damages to a surface of rolling bearing parts may be minimized during the removal process. Moreover, the medium is likely to accommodate to a surface of bearing parts, so that residual fine foreign matters may be effectively removed.

What is claimed is:  
     
         1 . A method for removing fine foreign matters comprising a process of removing the residual fine foreign matters with a grinding medium having lower hardness than the residual fine foreign matters prior to a high precision water-washing process in manufacturing bearing parts.  
     
     
         2 . The method according to  claim 1 , wherein the grinding medium has various shapes.  
     
     
         3 . The method according to  claim 1  or  claim 2 , wherein the grinding medium is made from corn-cob as a raw material.  
     
     
         4 . The method according to any one of  claim 1  to  claim 3 , wherein a barrel finishing machine is used in the process of removing residual fine foreign matters.  
     
     
         5 . A rolling bearing comprising parts from which residual fine foreign matters are removed by the method according to any one of  claim 1  to claim  4 .